Automatic pseudokeyphasor generator

Abstract

A pseudokeyphasor signal control unit incorporated into apparatus for analyzing the vibratory behavior of a rotating machine in response to signals representing vibrations occuring in the machine, which apparatus includes: a controllable signal generator connected to receive an input signal representing the rate of rotation of the machine and to produce an output signal representing a rate of rotation bearing a selected relation to the rate of rotation represented by the input signal, the generator being responsive to digital signals which set the value of the selected relation; and a signal analyzing device connected to receive the signals representing vibrations and the output signal from the signal generator for processing the signals representing vibrations as a function of the machine rotation rate represented by the output signal from the signal generator. The unit is composed of a digital signal supply member providing first digital signals representing the value of the selected relation; and an electrically controlled signal supply member connected between the digital signal supply member and the controllable signal generator for supplying to the controllable signal generator second digital signals which correspond to the first digital signals and which act to set the value of the selected relation.

What is claimed is: 
     
       1. In apparatus for analyzing the vibratory behavior of a rotating machine in response to signals representing vibrations occurring in the machine, which apparatus includes: a controllable signal generator connected to receive an input signal representing the rate of rotation of the machine and to produce an output signal representing a rate of rotation bearing a selected relation to the rate of rotation represented by the input signal, the generator being responsive to digital signals which set the value of the selected relation; and a signal analyzing device connected to receive the signals representing vibrations and the output signal from the signal generator for processing the signals representing vibrations as a function of the machine rotation rate represented by the output signal from the signal generator, the improvement comprising: digital signal supply means providing first digital signals representing the value of the selected relation; and   electrically controlled signal generating means connected between said digital signal supply means and said controllable signal generator for supplying to said controllable signal generator second digital signals which correspond to the first digital signals and which act to set the value of the selected relation   
     
     
       2. Apparatus as defined in claim 1 wherein said signal generating means comprise a plurality of relays each having a coil and movable switch means which are moved between a first switching state and a second switching state when said coil is supplied with an energizing current, each said coil being connected to said digital signal supply means so that the supply of energizing current is controlled by a respective first digital signal from said digital signal supply means and each said movable switch means being connected to said controllable signal generator for supplying a respective second digital signal having a signal state dependent on the switching state of said movable switch means. 
     
     
       3. Apparatus as defined in claim 2 wherein the first digital signals have a form different from the second digital signals. 
     
     
       4. Apparatus as defined in claim 2 wherein: the selected relation represented by the output signal of said controllable signal generator includes a multiplication factor and a division factor;   said controllable signal generator is responsive to two groups of digital signals, one group defining the value of the multiplication factor and the other group defining the value of the division factor; and said plurality of relays are composed of two groups of relays, each group providing a group of second digital signals defining the value of a respective factor.   
     
     
       5. Apparatus as defined in claim 4 wherein the input signal supplied to said controllable signal generator is constituted by a pulse train having a repetition rate corresponding to the rate of rotation of the machine, and said controllable signal generator is operative to give said output signal the form of a pulse train having a repetition rate different from that of the input signal. 
     
     
       6. Apparatus as defined in claim 5 wherein said signal analyzing device is a vector filter having a plurality of filtering channels each connected to receive a respective signal representing vibrations and said output signal from said controllable signal generator. 
     
     
       7. Apparatus as defined in claim 1 further comprising conductor means connected for supplying to said digital signal supply means third digital signals which correspond to the first digital signals and which act as status signals.